1.设置View阴影
button.layer.shadowOffset = CGSizeMake(0, 5); //设置阴影的偏移量
button.layer.shadowRadius = 10.0; //设置阴影的半径
button.layer.shadowColor = [UIColor blackColor].CGColor; //设置阴影的颜色为黑色
button.layer.shadowOpacity = 0.6; //设置阴影的不透明度
2.计算文字长度
CGSize size = [contentString sizeWithFont:[UIFont systemFontOfSize:14.0]
constrainedToSize:CGSizeMake(310, 2000)
lineBreakMode:UILineBreakModeWordWrap];
3.计算俩个纬度之间的距离
CLLocation * newLocation = [[CLLocation alloc]initWithLatitude:32.0206410 longitude:118.7889040];
NSString *km = [NSString stringWithFormat:@"%0.2f km",[[current location] distanceFromLocation:newLocation]/1000]
4.代码统计
find . "(" -name "*.m" -or -name "*.mm" -or -name "*.cpp" -or -name "*.c" -or -name "*.xib" -or -name "*.plist" -or -name "*.pch" -or -name "*.h" -or -name "*.rss" ")" -print | xargs wc -l
5.计算时间间隔
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
unsigned int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit |NSMinuteCalendarUnit| NSSecondCalendarUnit;
NSDateComponents *comps = [gregorian components:unitFlags fromDate:commentDate toDate:[NSDate date] options:0];
int month = [comps month];
int day = [comps day];
int hour = [comps hour];
int minute = [comps minute];
int second = [comps second];
if (month == 0 && day == 0 && hour == 0 && minute == 0 && second >= 0) {
commentDateString = [NSString stringWithFormat:@"%d秒前",second];
}else if (month == 0 && day == 0 && hour == 0 && minute >0){
commentDateString = [NSString stringWithFormat:@"%d分前",minute];
}else if (month == 0 && day == 0 && hour > 0){
commentDateString = [NSString stringWithFormat:@"%d小时前",hour];
}else if (month == 0 && day > 0){
commentDateString = [NSString stringWithFormat:@"%d天前",day];
}
6.调用地图服务
Google导航 directionsmode = driving, transit, or walking
comgooglemaps://?saddr=北京&daddr=上海&directionsmode=driving
苹果导航
http://maps.apple.com/?saddr=北京&daddr=上海
经纬度转换地址
http://maps.googleapis.com/maps/api/geocode/json?latlng=31.548182,120.241914&sensor=true&language=zh
7.显示Library文件夹
defaults write com.apple.finder AppleShowAllFiles YES
chflags nohidden $HOME/Library
8.导入XML解析库
libxml2.dylib
Header Search Paths ＝ /usr/include/libxml2
Other Linker Flags = -lxml2
9.Arc下使用非Arc类库
-fno-objc-arc
10.App Infomation
http://itunes.apple.com/lookup?id=683790165